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07 August 2001 <br /> AGE-NC Project No. 99-0605 <br /> Page 4of6 <br /> Lo • Total petroleum hydrocarbons quantified as diesel (TPH-d) and as motor oil (TPH-mo) in <br /> accordance with EPA Method 8015M. <br /> Soil samples B 1-20,B2-20,B2-30,B2-40,B2-50,132-60,B3-20 and B4-20 and ground water sample <br /> 132 were analyzed for the following: <br /> LO Fuel additives di-isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), MTBE, tert amyl <br /> methyl ether(TAME),tertiary butanol (TBA),methanol, ethanol,ethyl dibromide(EDB)and <br /> 1,2 - dichloroethane (1,2 - DCA) by EPA Method 8260 Modified. <br /> 4.0. FINDINGS <br /> Ile hydrocarbon impact to soil and ground water was quantified by the laboratory data obtained <br /> from the soil and ground water samples. The site geological model was constructed from the soil <br /> sample descriptions. <br /> 4.1. SOIL PROFILE <br /> Generally, brown to gray, dry silt was observed from approximately 5 feet bsg to approximately <br /> 35 met bsg in sail boring Bi. Silt was ocsen ed from 15 to 25 feet bsg Room 40 feet to.50 feet and <br /> at 65 feet bsg in boring B2. Sand or silty sand was encountered at 25 feet bsg to 35 feet bsg; from. <br /> 55 feet to 60 feet bsg; and at 70 feet bsg in the same soil boring. <br /> Silt was observed from 5 to 10 feet bsg and 20 feet to 30 feet in boring 133 and B4,while silty sand <br /> was encountered at 15 feet bsg in these-soil borings. Boring logs are included in Appendix A. <br /> 4.2. ANALYTICAL RESULTS OF SOIL SAMPLES <br /> MTBE was detected in soil samples B2-20, B2-30 and 132-40 at concentrations of 120 micrograms <br /> per milligram (ug/mg), 1,200 gg/mg and 63 ug/mg, respectively. <br /> TPH-g, TPH-d, THP-mo, BTEX, D1PE, ETBE, TAME, TBA, methanol, ethanol, EDB and 1,2 - <br /> DCA were not detected above laboratory reporting limits in any of the soil samples submitted for <br /> analysis. Analytical results of the soil samples are summarized in Tables 3 and 4. The laboratory <br /> �. report(MAI Lab IDs 60638 through 60643 and 60645 through 60649) and chain-of-custody forms <br /> are included in Appendix B. <br /> ` Advanced GeoEnvironmental,Inc. <br /> 1r <br />